Scale.



L. IAENICHEN.`

SCALE.

APPLICATION FILED JAN. l5. |916.

Patented J mie 6, 1916. '2 sHEETs-sHEET' Illllll TL L L@ ms s maxi :Mew

L. JAENICHEN.

SCALE.

APPLICATION FILED 1AN.I5. |916- V Patented June 6, 1916.

2 SHEETS-SHEET 2.

53 Lmw's LA :mix @Mm ycitizen of un. United nectionbetweenthe-load-resisti'ng springs UNITED srnlisrirmvr crimen.

LOUIS JAENICHEN', 0F DETROIT, MICHIGAN, ASSIGNOR. TO SK'IANDARDDCOMPUTING SCALE COMPANY, LIMITED, OF DETROIT, MICHIGAN, A LIMITEDPARTNERSHIP.

SCALE.

Specification o Letters lpatent.

v Patented J une 6, 1916.

Application led January 15, 1916. Serial No. 72,187.

To all whom t may concern.'

`Be it known that I LoUIS.-\JAENroHnN, ai

Detroit, in the county ofv Wayne and State of Michigan, have inventedanew and Im proved Scale, of`.which 'theffo'llowing is specification.

This inventionrelates to computing scales in which the relativelengths-ofy the-v lever armsA are varied `by means .of thermo-stats, andits object is to provide -a -movable conandthe main |lever of the scalewhich conne-ct1on shall'involve a mlnimum' amount of friction.`

-' This invention consists, in combinationof 'fload receiving lever, aload resisting memr'connected thereto, a thermostat for shifting `onemember. relativefto the other and novel; connecting mechanism betweenthe lever and the load resistingfmember provided with knife edge pivotsWherebygthe friction between vsaid members ,is keptdidownffxto a is anelevation of a scale having a portion of the pedestal broken away. Fig.2 is a lan'of the 'main lever of this scale. Fig. 3

1s a longitudinal section and Fig. 4 is al transverse section of themain lever through the connection between the main lever and the loadresisting springs. Fig. 5is a longitudinal and Fig. 6 a transversesection of the main lever'through a modified form of connection for thesprings. Figs. 7 and 8 are corresponding views ofstill another modi` ication of this general idea.

of the two arms ofthe main scale lever canl 7 Similarreferencecharacters refer to like parts throughout the several views.

In all spring scales, the springs become slightly weaker lwithincreasing temperatures, and hence a given load on the load receiverwill cause s ightly greater expansion of the springs at hightemperatures than at low, usually resultin in short weight. On the otherhand, i the scale is sealed at yhigh temperature, the scale will weighlong during colder-weather. The relative lengths be sc changed vas tocounteractthis action of the springs, but devices for such purpose mustoperate with a minimum 0f friction at all times. I propose to provide athermotates, and residing at vsupports a pedestal 2, and on this ismounted a shell 3 having a window 4 through which the figures on anordinary indicating drum can be' seen. This drum is actuated by arod 5,and the movement of this rod may be resisted by a pair of springs 6. Thesprings and indicator rod 5 may connect to a cross-bar 7 in any desiredmanner.

The main lever (Fig. 2) is formed of sideibars 9, an intermediate crossbar 10, a heavy counter-weight. 11, and an extension or neck 12. Thislever has pivots 13 that rest on the posts 14 carried by the base andpivots 15 on which rest the posts 16 of the support 17 of the platform18. A stem 19 on the platform support receives 011e end of the link 20,the other end of the link being pivoted below the pivots 13 in the usualmanner.v

A pair of rods 22 are slidable in the cross bar 10 and connect to therod 23 by means of'- a small bar, 24. These rods are also mostat ormedof members 26 and 27, the members 26 having higher coeiicients of eX-ansion than the members 27, the former belng preferably of brass and thelatter of steel.` This thermostatl is connected to the part 10 of themain lever and serves to draw the rod 23 toward the pivots 13 as thetemperature increases and to force it outwardly as the temperaturefalls. Any other desired form of thermostat, lever, and platform supportmay be employed as the parts thus far described form no part of thepresent invention.

Referring now to Figs. 3 and 4, it will be noticed that the extension 12ofthe main lever is formed with an upwardly extending arm 30 thatcarries apin 31 to which is connected a bearing 32. The rod 23 has ahead 33 on its outer end and is provided with the knife edge pivots 34and a bearing 35. A bearing plate 36 having pivots at its endsengaging'in the bearings 32 and 35 transmitsI the downward thrust of thearm 30 of the main lever to the/head 33, ywhile the side plates 3701u-the cross bar 7 are formed with openings 38 and bearings 39 torecelve the 4'carries .pivots 51.

pivots 34 and thus transmit this downward pressure from the main leverto the sprlngs 6. I

It will be understood that there is always some downward pull on thesprings 6 biecause of the weight of the lever and platform, althoughsome of this weight may be counterbalanced by the part 11 of the scalelever. When therefore the inner end of the lever is depressed by a.load, the arm 30 will press down on the compression member 36 andthrough it, down on the head 33 and the pivots 34. The distance from thepivot 13 to the pivot 34 is the length of the lever arm and will dependupon the action of the thermostat.

' As there is no stress on those portions of the rods 22 that extendthrough the cross bar 10, the friction at this point may be disregarded.The friction at 'the bearings 32 and 35 may also be disregarded as it ismerely theoretical. The action of the thermostat therefore is notinterfered with in any manner and it operates freely irrespective of theforce transmitted by the plates 37 from the pivots 34 to the cross bar 7and to the indicator rod 5 and springs 6. This connection whereby forceis transmitted f-rom the end of the leverto the adjacent movable end ofthe rod 23 may be varied in many ways. In Figs. 3 and 4 thls connectionis on the order of acompression member, while in Figs. 5 and 6, theconnecting member is in tension. The cross-bar 40 has connected to itthe flat side bars 41 which are joined by the lower member 42, whoseupper edge is in the form of a knife-edge.

to engage the bearing 43 carried4l ythe downwardly extending 4arm 44 ont epart 12 of the main lever. The rod 23 has a head 45 formed with abearing 46 to receive the lknife-edge 47 on the cross-bar 40. A smallloop or stirrup 48serves as a connection for the indicator .-rod. Stillanother connection is shown in TFi'g. 7. The end 12 of the lever isformed with an end 50 which The rod 23 carries an end 52 formed with agroove for the bearing balls 53 that bear on the short shaft 54. Thisshaft is secured in the lower ends of the side plates 55 that are formedwith openings 56 to receive the pivots 51, and these plates connect tothe cross-bar 57. When this construction is employed, the bars 26 of thethermostat must be of steel or other metal of lower coeicient ofexpansion than the bars 27. In each of these three cases','ltheconnection between the *rod to springs, indicator rod, main lever andthermostat are substantially frictionless.

I claim 1. In a weighing scale, the combination of a main lever, aspring to resist the movement of the lever under a load, a thermostatmounted on said lever, a member pivotally connected to said lever and tosaid spring, and means connected to said thermostat and 'said spring forvarying the el'ective length of the lever.

2. In a weighing scale, the combinationl of a main lever, a spring toresist the movement of the lever under load, a link to which the springis connected, a thermostat mounted on the lever, a rod connecting thethermostat to said bar whereby the thermostat may move the end of the sring toward and Amounted on the leger, a rod connected to saidthermostat andi-'extending parallel to the line of the scale, a loadresisting spring connected to said rod adjacent the end of said lever,and a connecting member adjacent the spring and having knife-edge pivotsengaging said rod and lever whereby the lever may transmit stresses dueto loads on the scale to said spring,l the length of the lever arm beingcontrolled by said rod and thermostat.l

4. In a weighing scale, the combination of a main lever, a spring toresist the movement of the lever under a load, a thermostat mounted onthe levera rod connected to said thermostat and extending parallel tothe line of the scale, a load resisting spring curved in a verticalplane away from said ermit the connecting member to be of considerablelength.

In testimony whereof I sign this specification.

' LOUIS J AENICHEN.

